成果報告書詳細
管理番号20150000000388
タイトル*平成26年度中間年報 次世代材料評価基盤技術開発 (1)有機EL材料の評価基盤技術開発
公開日2016/4/1
報告書年度2014 - 2014
委託先名次世代化学材料評価技術研究組合
プロジェクト番号P10029
部署名電子・材料・ナノテクノロジー部
和文要約
英文要約Title: Development of Fundamental Evaluation Technology for Next-Generation Chemical Materials

 The major target of the project is the establishment of standard evaluation cells and evaluation basis for the purpose of ensuring lifetime and performance of organic electronic devices. Using 30×30mm-size glass substrate-based OLED cells which are mono-color green and multi-photon emission type white, those evaluation technologies for the brightness/chromaticity dispersion and the spatial distribution of luminous intensity at initial and degraded condition were developed. The lifetime prediction method was started to application for OLED cells. It has been almost established for green and red multilayer mono-color phosphorescent devices, and green/red mixed-color phosphorescent devices phosphorescent. The analysis of the device degradation mechanism has been continued by considering the impact of external factors such as moisture. The basic evaluation technologies of film substrate-based OLED cells were established by clarifying the correlation between moisture barrier capability and environmental accelerated degradation characteristics and by referring to those of the glass substrate-based OLED cells. Computer simulation of improving outcoupling efficiency was found out to optimize structures of encapsulation and OLED devices on plastic substrate. OLED devices involved the optimized structures demonstrated that the structures is effective to improve outcoupling efficiency. In development of roll to roll (R2R) processed OLED devices, tuning process conditions enabled stable performance and continuous production of OLED devices. In order to improve performance of R2R processed OLED devices, defects in OLED devices was analyzed and high-speed coating was developed. Methods for preparing OLED devices on ultra-high- barrier films have been developed. The multi-photon emission type white OLED cells with high efficiency and long lifetime were developed by using new light-emitting materials for blue and red, and also trial production of those with the 80×80mm-size emitting has been started. For the purpose of the establishment of non-destructive analytical technologies on device degradation of OLEDs, impedance spectroscopy and nonlinear optical sum-frequency generation spectroscopy and Raman spectroscopy have been developed. As for impedance spectroscopy, an SCLC model for a multilayer charge transport structure was proposed, and the origin of negative capacitance observed in low frequency range on various electric devices was clarified. Using sum-frequency spectroscopy, the decrease in the intensity of Alq3 layer polarization was detected directly as a result of increasing of Alq3 orientation randomness. Raman spectroscopy was used for evaluating temperature distribution for OLEDs with large emission area and for detecting molecular state of accumulating charge at an αNPD/Alq3 interface. Additionally, transient absorption spectroscopic measurements were carried out to clarify the emission mechanisms of thermally activated delayed fluorescence (TADF) OLEDs. A joint work by Kyushu University group and CEREBA has been performed. Traps in component layers of TADF OLEDs and their quantity change were evaluated by use of the procedure developed for conventional phosphorescent OLEDs. For the high-sensitivity evaluation of water barrier capability, three evaluation techniques for the gas barrier characteristics, API-MS, CRDS, and DELTAPERM, have been developed, and coincidence of the evaluated results by three different methods were shown. The evaluation method on 10-5 g/m2/day level barrier capability were thus established.
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